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Urchin | Rotary Shell Ejecting Foam Blaster 3D Printer File Image 1
Urchin | Rotary Shell Ejecting Foam Blaster 3D Printer File Image 2
Urchin | Rotary Shell Ejecting Foam Blaster 3D Printer File Image 3
Urchin | Rotary Shell Ejecting Foam Blaster 3D Printer File Image 4
Urchin | Rotary Shell Ejecting Foam Blaster 3D Printer File Thumbnail 1
Urchin | Rotary Shell Ejecting Foam Blaster 3D Printer File Thumbnail 2
Urchin | Rotary Shell Ejecting Foam Blaster 3D Printer File Thumbnail 3
Urchin | Rotary Shell Ejecting Foam Blaster 3D Printer File Thumbnail 4

Urchin | Rotary Shell Ejecting Foam Blaster

Bruce LeedleLeedleLeedleLee avatarBruce LeedleLeedleLeedleLee

January 9, 2026

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DescriptionCommentsTags

Description

This uses Sillyshells, get them here: https://www.printables.com/model/880038-silly-shells-for-homemade-nerf-blasters

Thanks to sillybutts for creating the sillyshell ecosystem!

Overview:

  • Rotary Sillyshell Launcher with ejection on the reload

  • Super Low hardware requirements

  • Ejects Shells

  • Can Fire Most Shells (Barring missile spigots)

  • Can Fire MXL and Mega uncut

  • Ironsights, Primegrip and Cheekrest files included

  • Optional TPU seals for those who can print it

Printing and hardware:

  • 3 Walls 20% infill for color A and color B, 5 Walls 20% infill for color C. No supports.

  • 180mm³ Printer needed

  • 4mm elastic string required (this stuff), like 1,5m, maybe more, this fits a lot of string

  • 6-12 Kitchen rubberbands needed (Circumference like 12cm)

Showoff:


Assembly guide:

License:

Standard Digital File License

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